\[\boxed{\text{700.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ xy = - 3\]
\[y = - \frac{3}{x} - гипербола.\]
\[\textbf{б)}\ 6y - 2 = 0\]
\[6y = 2\]
\[y = \frac{1}{3} - прямая.\]
\[\textbf{в)}\frac{1}{4}y - x^{2} = - 1\]
\[\frac{1}{4}y = x^{2} - 1\]
\[y = 4x^{2} - 4\ (парабола).\]
\[\textbf{г)}\ 10 + 5xy = 0\]
\[5xy = - 10\]
\[xy = - 2\]
\[y = - \frac{2}{x}\ (гипербола).\]
\[\textbf{д)}\ 1 + 2x = 0\]
\[2x = - 1\]
\[x = - \frac{1}{2}\ (прямая).\]
\[\textbf{е)}\ 2x - 2y = 5\]
\[2y = 2x - 5\]
\[y = x - 2,5\ (прямая)\text{.\ }\]